DESCRIPTION

Runtime Configuration

The following
sysctl(8)
variables are available in addition to those available to all
sound(4)
devices:

dev.pcm.%d.polling

Experimental polling mode, where the driver operates by querying the device
state on each tick using
callout(9).
Polling is disabled by default.
Do not enable it unless you are facing weird interrupt problems or if the
device cannot generate interrupts at all.